In the last chapter of Shampoo 1/2 I posted, several people have asked me
how is it Ukyou knew the 'Bakusaii Tenketsu' to blow Tessai into tiny
pieces. I decided to make it easy and just answer everyone all at once and
clarify it for others that wondered but didn't feel any burning desire to
ask. Way way way back in Chapter 10 (was it really almost a year ago?) ,
Cologne taught both Ukyou and Ryouga the technique. Ukyou mastered it
first, in fact. Since then I believe she only used one other time in
Chapter 23 when she was sparring with Shampoo. Yep. This one was a long
time in coming.

Hope that answered the question. 

Sorry for the spam

D.B. Sommer